20529911 has 2 divisors, whose sum is σ = 20529912. Its totient is φ = 20529910.

The previous prime is 20529881. The next prime is 20529917. The reversal of 20529911 is 11992502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20529911 - 2¹⁰ = 20528887 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20529917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10264955 + 10264956.

It is an arithmetic number, because the mean of its divisors is an integer number (10264956).

Almost surely, 2^20529911 is an apocalyptic number.

20529911 is a deficient number, since it is larger than the sum of its proper divisors (1).

20529911 is an equidigital number, since it uses as much as digits as its factorization.

20529911 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620, while the sum is 29.

The square root of 20529911 is about 4530.9944824508. The cubic root of 20529911 is about 273.8182279567.

The spelling of 20529911 in words is "twenty million, five hundred twenty-nine thousand, nine hundred eleven".